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This Week at Physics

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Events on Thursday, April 23rd, 2015

R. G. Herb Condensed Matter Seminar
Quantum Spins in Nanostructures: Coherence, Measurement, and Collective Dynamics
Time: 10:00 am
Place: 5310 Chamberlin Hall
Speaker: Bill Coish, McGill University
Abstract: Qubit coherence measurements are now sufficiently accurate that they can be used to perform 'spectroscopy' of noise due to a complex environment. Measuring not only the decay time, but also the form of decay as a function of some external parameter (e.g. temperature) can determine the nature of the dominant decoherence source. I will describe how temperature-dependent measurements of qubit decoherence time and form of decay can be used to identify microscopic dephasing sources in a semiconductor environment.

I will also briefly discuss some new tricks to enhance the fidelity of generic qubit measurements and prospects for generating and observing genuine collective quantum effects in ensembles of nuclear spins embedded in silicon nanostructures.
Host: Coppersmith
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NPAC (Nuclear/Particle/Astro/Cosmo) Forum
The status of India-based Neutrino Observatory (INO)
Time: 2:30 pm
Place: 5310 Chamberlin Hall
Speaker: Bannanje Sripathi Acharya, Tata Institute
Abstract: In this talk I shall narrate our plans of building a new underground laboratory facility in southern India called India-based neutrino observatory (INO). A 50 kilo-ton magnetised Iron CALorimeter (ICAL)is one of the first experiments proposed to be housed in this observatory for the study of neutrino properties like mass hierarchy, precision measurement of oscillation parameters etc. using the atmospheric neutrinos. The details of this ICAL project and its present status will also be covered in this talk.
Host: Justin Vandenbrouke
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Astronomy Colloquium
"Gamma-rays from Type Ia supernova SN2014J "
Time: 3:45 pm
Place: 4421 Sterling hall
Speaker: Eugene Churazov, MPA Garching
Abstract:
Supernova SN2014J in M82 is the first type Ia supernova, which was close enough to allow robust detection of gamma-ray lines associated with the decay chain Ni56->Co56->Fe56. INTEGRAL observations provide constraints on the total mass of the Ni56 synthesized during explosion, on the released energy, on the mass of the progenitor and on the annihilation of positrons, produced by the Co56 decay. We discuss the implications of these observations for SNIa models and compare results with the predictions of different Type Ia scenarios.
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